Getting rid of Crab Grass

okay... Sorry for the delay in posting back but I had to wait for my
lawn to start to grow back so that you can see my problem. I took a
really good picture so that you can see what the "crab grass" (or
whatever it is) looks like. Could someone please diagnose the problem
and let me know the treatment to use?

Well, it isn't crabgrass. I get a lot of that in my yard. I've wondered
exactly what it is, but never took a sample to the nursery to get a
definitive answer.
Don't let it go to seed. It pulls pretty easily, and it doesn't come
back.
If you don't want to pull it, kill it with a grassy weed killer.
1. Let it get taller than the good grass.
2. Wrap a cloth TIGHTLY around a garden rake.
3. Dip the cloth in full-strength weed killer (I think I used RoundUp).
Make sure it doesn't drip.
4. Wipe the cloth back and forth over the taller grass you want to kill.
Warnings: RoundUp kills almost everything. Don't get it where you don't
want it. Don't let the weed killer drip.

You're welcome. Let us know how things work out.
By the way, wear rubber gloves.
Wait a week or two, then apply the weed killer again. It's not possible
to get it on evenly or heavily enough with this technique to kill
everything in the first pass. Heck, RoundUp doesn't even work that well
when applied according to the label -- it always takes several
applications.
You can use a similar technique in flower beds with a cotton glove. This
one works better because you can work your fingers better than you can
work a rake. Be sure to wear a rubber glove under the cotton glove.

Why?
Again, why? Are you made of plant material?
And, why slop it on with a rag tied on a rake? A paintbrush would be much
more efficient than a rag tied to a rake. How are you going to keep a
soaked rag from dripping all over everything surrounding the plant in
question? That's one of the most rediculous methods of applying a herbicide
that I've ever heard of.
Also, why go right to a non-selective herbicide in the first place? A
better avenue would be to identify the weed, and find a selective herbicide
that will knock it back. Glyphosate is *so* over-used by homeowners, when
2,4-D would be a better choice.

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